For certain recruiting activities such as Combines, we desire the ability to show player demographic data alongside their performance data. As we value the privacy of our players and their data, we do our best to help protect their personal information by presenting their gameplay and their demographic information in an anonymized format.
For Anonymized profiles, the username/gamertag displayed on the profile is not the real user's gameplay tag. The gameplay and the statistics are indeed real, the gamertag simply is not.
When you send a message to the anonymized profile, the real player will receive it and can communicate with you under the anonymized profile. They may choose at their own discretion whether or not to provide you further personalized details or share the link to their public profile.